Relationship between the order of rotation symmetry in perforated apertures and terahertz transmission characteristics

Design and simulation of a new narrow terahertz bandpass filter

“…These two types of bandpass filters, as shown in Fig. 6, have transmission coefficients of 90% [8,[21][22][23] and 100%, respectively (Fig. 7).…”

“…7). Cylindrical asterisk bandpass filters have the least noise (unwanted frequencies) among all the bandpass filters ever designed and fabricated (especially rectangular asterisk bandpass filters [8][9][10]). In a rectangular type, when the width of the filter (W) increases, the output spectrum coefficient decreases, while the noise (unwanted frequencies) increases (Fig.…”

“…In the following, a new type of asterisk filter was proposed. In its output spectrum, it was shown to have lower noise (or unwanted frequency) than other asterisk filter samples [8].…”

Anisotropy Modeling of Terahertz Metamaterials: Polarization Dependent Resonance Manipulation by Meta-Atom Cluster

“…With respect to the meta-atom structure, unlike the structures of polarization independent metamaterials, such as the cross and ring-shaped structures 31 32 33 , Split-ring resonators (SRRs), cut-wires (CWs) 34 , or their complementary structures 35 are the most well-known metamaterial structures that exhibit anisotropic properties depending on the polarization property of the incident waves. Particularly, in the optical and terahertz regimes, planar SRR structures have a fundamental LC resonance, as well as a half wave resonance, (or plasmonic oscillation) along the side length of the SRR unit cell 8 36 .…”

Characteristics of terahertz wave modulation using wavelength-selective photoexcitation in pentacene/Si and TIPS pentacene/Si bilayers

“…[22][23][24] The THz waves were generated using a (100) p-type InAs crystal in which the transient photo-Dember field plays a dominant role, transmitted through a 3-mm-diameter pinhole to the organic/inorganic hybrid structures, and detected using the photoconductive antenna method. Several continuously emitting CW laser diodes with center wavelengths of 830, 808, 785, 685, 660, 642, and 637 nm, with an intensity of 940 mW/cm 2 and oblique angle of 45 • , were employed as the light source for photoexcitation.…”